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I figured out what the problem was!!! Basically in my ros msg type I was inheriting the PoseStamped msg from geometry_msgs. So on one of my machine the common_msgs (or geometry_msgs) package was from ROS Fuerte and the other had ROS Electric. There is probably (actually definitely) some difference in the msg definitions between the 2 versions, causing a mismatch when a Fuerte PoseStamped msg was being deserialized referencing an Electric PoseStamped msg. Thus the ERROR: No module name genpy.rostime
What is bothering is the fact that the Error said very very little about the actual problem it faced deserializing (NOT ROS's fault anyway), but such is life. Anyways please be careful mixing Electric and Fuerte, it could be dangerous.
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